Virtually the entire catalogue of DRM-free good old games at GOG.com is on sale for up to 50% off through the new year, and they are adding a free copy of Tyrian 2000 to everyone's order as a virtual stocking stuffer. The Humble Indie Bundle #2 is now available, offering the chance to pay what you want for a bundle of Braid, Cortex Command, Machinarium, Osmos, and Revenge of the Titans, once again allowing you to give some of your contribution to charity. Amazon has a boatload of console games on sale (thanks Batman via Gamerdeals).
Two or more eligible games on the EA Store are 50% off. GamersGate has a buy four, pay for three promotion. There are a bunch of strategy games on sale on Matrix Games.

I'd have been happy to buy Just Cause 2 at full price... but I have XP. And so far my only reason to upgrade to any other OS is Just Cause 2. I'm no closer to upgrading now than I was when it came out. Good game, bad move. If there was some kind of hack or patch to allow it to be played on XP I'd buy it. But no

I ended up scooping Gothic II gold. I'll give that a whirl after I've exhausted Risen.